Function roundtrip

nodedb-array/src/codec/tile_decode.rs:231–235

(tile: &SparseTile)

    }

    fn roundtrip(tile: &SparseTile) -> SparseTile {
        let mut buf = Vec::new();
        encode_sparse_tile(tile, &mut buf).unwrap();
        decode_sparse_tile(&buf).unwrap()
    }

    #[test]
    fn empty_tile_roundtrip() {